How many grams are in 7.8 moles of NaCl?

456.3g

Explanation:

Mass in grams = ?

Number of moles = 7.8 moles

Molar mass of NaCl = ?

For molar mass of NaCl, use atomic mass of sodium Na, = 23; Chlorine Cl = 35.5

NaCl = (23 + 35.5) = 58.5g/mol

Apply the formula:

Number of moles = (Mass in grams / molar mass)

7.8 moles = Mass /58.5g/mol

Mass = 7.8 moles x 58.5 g/mol

Mass = 456.3g

Thus, there are 456.3g in 7.8 moles of NaCl.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.